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3 to 4 speed speedo gears? |
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53w
AMC Apprentice Joined: Sep/14/2010 Status: Offline Points: 236 |
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Posted: May/06/2016 at 5:18pm |
I changed from an 3speed manual to a 4speed manual.
Will the 3 speed speedo gear work in my four speed? If not, where do I buy the correct one and how do I figure which one I need for different rear end ratios |
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tyrodtom
AMC Addicted Joined: Sep/14/2007 Location: Virginia Status: Offline Points: 6199 |
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Nobody can hardly say without knowing what 3speed you had, and what 4 speed you switched to.
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66 American SW, 66 American 2dr, 82 J10, 70 Hornet, Pound, Va.
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53w
AMC Apprentice Joined: Sep/14/2010 Status: Offline Points: 236 |
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very good point, but I not too sure myself
1974 javelin 304 with 3 speed manual on the floor factory changed out to amc t10 4 speed manual out of ?.... , not sure was told it was amc t-10 and it would fit my javelin and it did. wish I had exact numbers, but that all I know. Can I take the speedo cable and gear from 3 speed manual that is hanging there and put it in the 4speed and have it work? |
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1970390amx
AMC Addicted Joined: Jul/11/2008 Location: colorado Status: Offline Points: 3311 |
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probably, the only question would be the tooth count on the output shaft of each transmission. Should work how accurate is another question.
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1970 390 4speed Bittersweet shadow mask AMX
1970 Amx missing most everything, or in a box |
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53w
AMC Apprentice Joined: Sep/14/2010 Status: Offline Points: 236 |
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That's what I need to know. It looked like it would fit in the hole, but was unsure if gear was correct to mesh with the trans gear. I didn't want to put it in with out asking first if it was right fit to match up with 4speed trans gear. I don't mind mph being off due to tooth count, I can fix that later with correct gear. I maybe swapping rear ends out any way and ratio may change, thus gear tooth count will change again. I just trying to get speedo to move and make sure everything works. so does anyone no 100% that the gears will all mesh, taking 3speed speedo cable and gear out of 3 speed and putting it in to 4speed? |
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rocklandrambler
AMC Addicted Joined: Feb/09/2013 Location: Nanuet, NY Status: Offline Points: 3953 |
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Your TSM should list all the transmission gears on the last page of the TRANSMISSION section.
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Past AMC's
1974 Hornet X (new) 1975 Gremlin X (new) 1964 Classic 660 Cross Country 1965 American 440-H |
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vinny
Supporter of TheAMCForum Joined: Jan/05/2012 Location: Calgary Status: Offline Points: 2837 |
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Why not get a flashlight and look in the holes to see if there are obvious differences?
It probably doesn't mean anything to most of you fellows but by going from a 3.73 to a 3.07 differential in my truck it now seems to read correct in kilometers per hour by just doubling the number. |
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sidewinder
Moderator Group Joined: Oct/07/2007 Location: Niagara Falls, Status: Offline Points: 6665 |
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If you need a new gear I believe AMARK offers several....
Chuck Page |
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Chuck Page ,AKA Sidewinder
1968 "BLACK CHERRY" Javelin Previous owner of 2013 Heritage Cup winner 1970 BBO AMX |
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53w
AMC Apprentice Joined: Sep/14/2010 Status: Offline Points: 236 |
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I worked on it today and the 3speed speedo gear and cable end did fit into the 4speed. The Speedo seems right on with GPS read out.
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